A Uniform Rod Weighs 40 N and Is 1

question 20

Multiple Choice

A uniform rod weighs 40 N and is 1.0 m long.It is hinged to a wall at the left end,and held in a horizontal position at the right end by a vertical string of negligible weight,as shown in the figure.What is the magnitude of the torque due to the string about a horizontal axis that passes through the hinge and is perpendicular to the rod? The hinge is very small with negligible friction.

• A)40 N ∙ m
• B)10 N ∙ m
• C)5.0 N ∙ m
• D)20 N ∙ m
• E)30 N ∙ m

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